/* 首页样式 */
/* 版心 */
.wrapper {
    margin: 0 auto;
    width: 1200px;
  }
  
  body {
    background-color: #f3f5f7;
  }
  
  /* 头部区域 */
  .header {
    height: 100px;
    background-color: #fff;
  }
  
  .header .wrapper {
    padding-top: 29px;
    display: flex;
  }
  
  /* logo */
  .logo a {
    display: block;
    width: 195px;
    height: 41px;
    background-image: url(../images/logo.png);
    font-size: 0;
  }
  
  /* 导航 */
  .nav {
    margin-left: 102px;
  }
  
  .nav ul {
    display: flex;
  }
  
  .nav li {
    margin-right: 24px;
  }
  
  .nav li a {
    display: block;
    padding: 6px 8px;
    line-height: 27px;
    font-size: 19px;
  }
  
  
  /* actvie 类选择器，表示默认选中的a */
  .nav li .active,
  .nav li a:hover {
    border-bottom: 2px solid #00a4ff;
  }
  
  /* 搜索 */
  .search {
    display: flex;
    margin-left: 64px;
    padding-left: 19px;
    padding-right: 12px;
    width: 412px;
    height: 40px;
    background-color: #f3f5f7;
    border-radius: 20px;
  }
  
  .search input {
     flex: 1;
     border: 0;
     background-color: transparent;
     /* 去掉表单控件的焦点框 */
     outline: none;
  }
  
  /* ::placeholder 选中就是 placeholder 属性文字样式*/
  .search input::placeholder {
    font-size: 14px;
    color: #999;
  }
  
  /* 父级是flex布局，子级变弹性盒子：加宽高生效 */
  .search a {
    align-self: center;
    width: 16px;
    height: 16px;
    background-image: url(../images/search.png);
  }
  
  /* 用户 */
  .user {
    margin-left: 32px;
    margin-top: 4px;
  }
  
  .user img {
    margin-right: 7px;
    /* vertical-align 行内块和行内垂直方向对齐方式 */
    vertical-align: middle;
  }
  
  .user span {
    font-size: 16px;
    color: #666;
  }
  
  /* banner 区域 */
  .banner {
    height: 420px;
    background-color: #0092cb;
  }
  
  .banner .wrapper {
    display: flex;
    justify-content: space-between;
    height: 420px;
    background-image: url(../uploads/banner.png);
  }
  
  /* 侧导航 */
  .banner .left {
    padding: 3px 20px;
    width: 191px;
    height: 420px;
    background-color: rgba(0,0,0,0.42);
  }
  
  .banner .left a {
    /* 块级：宽度是父级的100% */
    display: block;
    height: 46px;
    background: url(../images/right.png) no-repeat right center;
    line-height: 46px;
    font-size: 16px;
    color: #fff;
  }
  
  .banner .left a:hover {
    background-image: url(../images/right-hover.png);
    color: #00a4ff;
  }
  
  /* 课程表 */
  .banner .right {
    margin-top: 60px;
    width: 218px;
    height: 305px;
    background-color: #209dd5;
    border-radius: 10px;
  }
  
  .banner .right h3 {
    margin-left: 14px;
    height: 48px;
    line-height: 48px;
    font-size: 15px;
    color: #fff;
    font-weight: 400;
  }
  
  .banner .right .content {
    padding: 14px;
    height: 257px;
    background-color: #fff;
    border-radius: 10px;
  }
  
  .banner .right dl {
    margin-bottom: 12px;
    border-bottom: 1px solid #e0e0e0;
  }
  
  .banner .right dt {
    margin-bottom: 8px;
    font-size: 14px;
    line-height: 20px;
    font-weight: 700;
  }
  
  .banner .right dd {
    margin-bottom: 8px;
    font-size: 12px;
    line-height: 16px;
  }
  
  .banner .right dd span {
    color: #00a4ff;
  }
  
  .banner .right dd strong {
    color: #7d7d7d;
    font-weight: 400;
  }
  
  .banner .right a {
    display: block;
    height: 32px;
    background-color: #00a4ff;
    text-align: center;
    line-height: 32px;
    font-size: 14px;
    color: #fff;
    border-radius: 15px;
  }
  
  /* 精品推荐 */
  .recommend {
    display: flex;
    margin-top: 11px;
    padding: 0 20px;
    height: 60px;
    background-color: #fff;
    box-shadow: 0px 1px 2px 0px rgba(211, 211, 211, 0.5);
    line-height: 60px;
  }
  
  .recommend h3 {
    font-size: 18px;
    color: #00a4ff;
    font-weight: 400;
  }
  
  .recommend ul {
    /* 除去标题和修改兴趣的尺寸，父级剩余尺寸都给ul，实现把修改兴趣挤到最右侧 */
    flex: 1;
    display: flex;
  }
  
  .recommend ul li a {
    padding: 0 24px;
    border-right: 1px solid #e0e0e0;
    font-size: 18px;
  }
  
  .recommend ul li:last-child a {
    border-right: 0;
  }
  
  .recommend .modify {
    font-size: 16px;
    color: #00a4ff;
  }
  
  /* 推荐课程 */
  .course {
    margin-top: 15px;
  }
  
  /* 标题 - 公共类，与其他区域共用 */
  .hd {
    display: flex;
    justify-content: space-between;
    height: 60px;
    line-height: 60px;
  }
  
  .hd h3 {
    font-size: 21px;
    font-weight: 400;
  }
  
  .hd .more {
    padding-right: 20px;
    background: url(../images/more.png) no-repeat right center;
    font-size: 14px;
    color: #999;
  }
  
  /* 课程内容 - 公共类 */
  .bd ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
  }
  
  .bd li {
    margin-bottom: 14px;
    width: 228px;
    height: 271px;
    background-color: pink;
  }
  
  .bd li .pic {
    height: 156px;
  }
  
  .bd li .text {
    padding: 20px;
    height: 115px;
    background-color: #fff;
  }
  
  .bd li .text h4 {
    margin-bottom: 13px;
    height: 40px;
    font-size: 14px;
    line-height: 20px;
    font-weight: 400;
  }
  
  .bd li .text p {
    font-size: 14px;
    line-height: 20px;
    color: #999;
  }
  
  .bd li .text p span {
    color: #fa6400;
  }
  
  .bd li .text p i {
    font-style: normal;
  }
  
  /* 前端 */
  .hd ul {
    display: flex;
  }
  
  .hd li {
    margin-right: 60px;
    font-size: 16px;
  }
  
  .hd li .active {
    color: #00a4ff;
  }
  
  .bd {
    display: flex;
    justify-content: space-between;
  }
  
  .bd .left {
    width: 228px;
    /* background-color: pink; */
  }
  
  .bd .right {
    width: 957px;
    /* background-color: pink; */
  }
  
  .bd .right .top {
    margin-bottom: 15px;
    height: 100px;
  }
  
  /* 版权 */
  .footer {
    margin-top: 60px;
    padding-top: 60px;
    height: 273px;
    background-color: #fff;
  }
  
  .footer .wrapper {
    display: flex;
    justify-content: space-between;
  }
  
  .footer .left {
    width: 440px;
    /* background-color: pink; */
  }
  
  .footer .left p {
    margin-top: 24px;
    margin-bottom: 14px;
    font-size: 12px;
    line-height: 17px;
    color: #666;
  }
  
  .footer .left .download {
    display: block;
    width: 120px;
    height: 36px;
    border: 1px solid #00a4ff;
    text-align: center;
    line-height: 34px;
    font-size: 16px;
    color: #00a4ff;
  }
  
  .footer .right {
    display: flex;
  }
  
  .footer .right dl {
    margin-left: 130px;
  }
  
  .footer .right dt {
    margin-bottom: 12px;
    font-size: 16px;
    line-height: 23px;
  }
  
  .footer .right a {
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }